Recent Advanced Development of Acid-Resistant Thin-Film Composite Nanofiltration Membrane Preparation and Separation Performance in Acidic Environments

• Published in: Separations Vol. 10; no. 1; p. 20
• Main Authors: Li, Mowen, Zhang, Wenhai, Zhang, Xuehong, Guo, Hongxia, Liang, Yucang
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01-01-2023
• Subjects: Acid resistance; acid-resistant nanofiltration membrane; Acids; Adsorption; Energy industry; Environmental protection; interface polymerization; Membrane separation; Membranes; Nanofiltration; nanofiltration membrane; Permeability; Polyamide resins; Polymerization; Pore size; preparation of membrane; Selectivity; Separation; separation performance; Solvent extraction processes; Thin films; Viscosity
• ISSN: 2297-8739; 2297-8739
• DOI: 10.3390/separations10010020

Membrane filtration technology has attracted extensive attention in academia and industry due to its advantages of eco-friendliness related to environmental protection and high efficiency. Polyamide thin-film composite nanofiltration (PA TFC NF) membranes have been widely used due to their high separation performance. Non-acid-resistant PA TFC NF membranes face tremendous challenges in an acidic environment. Novel and relatively acid-resistant polysulfonamide-based and triazine-based TFC NF membranes have been developed, but these have a serious trade-off in terms of permeability and selectivity. Hence, how to improve acid resistance of TFC NF membranes and their separation performance in acidic environments is a pivotal issue for the design and preparation of these membranes. This review first highlights current strategies for improving the acid resistance of PA TFC NF membranes by regulating the composition and structure of the separation layer of the membrane performed by manipulating and optimizing the construction method and then summarizes the separation performances of these acid-resistant TFC NF membranes in acidic environments, as studied in recent years.